oj.uz

Submission #1027009

# Submission time Handle Problem Language Result Execution time Memory
1027009 2024-07-18T18:23:27 Z lmToT27 Mecho (IOI09_mecho) C++14
84 / 100
 117 ms 7036 KB 
#include <bits/stdc++.h>
#define all(dataStructure) dataStructure.begin(),dataStructure.end()
#define ll long long

using namespace std;
namespace std {
        template <typename T, int D>
        struct _vector : public vector <_vector <T, D - 1>> {
                static_assert(D >= 1, "Dimension must be positive!");
                template <typename... Args>
                _vector(int n = 0, Args... args) : vector <_vector <T, D - 1>> (n, _vector <T, D - 1> (args...)) {}
        };
        // _vector <int, 3> a(n, m, k);: int a[n][m][k].
        // _vector <int, 3> a(n, m, k, x);: int a[n][m][k] initialized with x.
        template <typename T>
        struct _vector <T, 1> : public vector <T> {
                _vector(int n = 0, const T& val = T()) : vector <T> (n, val) {}
        };
}

const int MAX = 8e2 + 3;
const ll MOD[] = {1000000007, 998244353};

int dx[] = {1, -1, 0, 0};
int dy[] = {0, 0, 1, -1};
char a[MAX][MAX];
int n, s;
int badTime[MAX][MAX];
bool vs[MAX][MAX];
int d[MAX][MAX];

bool ok(int i, int j) {
        return i && j && max(i, j) <= n && a[i][j] != 'T';
}

void Solve() {
        cin >> n >> s;
        pair <int, int> house;
        pair <int, int> start;
        queue <pair <int, int>> q;
        for (int i = 1; i <= n; i++) {
                for (int j = 1; j <= n; j++) {
                        badTime[i][j] = 1e9;
                        cin >> a[i][j];
                        if (a[i][j] == 'D') house = {i, j};
                        if (a[i][j] == 'M') start = {i, j};
                        if (a[i][j] == 'H') {
                                vs[i][j] = 1;
                                badTime[i][j] = 0;
                                q.push({i, j});
                        }
                }
        }
        
        while (q.size()) {
                auto [u, v] = q.front();
                q.pop();
                for (int i = 0; i < 4; i++) {
                        int x = u + dx[i];
                        int y = v + dy[i];
                        if (ok(x, y) && !vs[x][y] && a[x][y] == 'G') {
                                vs[x][y] = 1;
                                badTime[x][y] = badTime[u][v] + 1;
                                q.push({x, y});
                        }
                }
        }

        auto check = [&](int val) -> bool {
                memset(vs, 0, sizeof vs);
                memset(d, 0, sizeof d);

                vs[start.first][start.second] = 1;
                queue <pair <int, int>> q;
                q.push(start);
                
                while (q.size()) {
                        auto [u, v] = q.front();
                        q.pop();
                        for (int i = 0; i < 4; i++) {
                                int x = u + dx[i];
                                int y = v + dy[i];
                                if (ok(x, y)) {
                                        if (vs[x][y] == 0 && (badTime[x][y] - (d[u][v] + 1) / s - 1) >= val) {
                                                vs[x][y] = 1;
                                                q.push({x, y});
                                                d[x][y] = d[u][v] + 1;
                                        }
                                }
                        }
                }
                
                return vs[house.first][house.second];
        };

        int ans = -1;
        int l = 0, r = badTime[start.first][start.second] - 1;

        while (l <= r) {
                int mid = (l + r) / 2;
                if (check(mid)) {
                        l = mid + 1;
                        ans = mid;
                } else r = mid - 1;
        }
        cout << ans;
}

int32_t main() {
        ios_base::sync_with_stdio(0);
        cin.tie(0);

        #define TASK "TASK"
        if (fopen(TASK".INP", "r")) {
                freopen(TASK".INP", "r", stdin);
                freopen(TASK".OUT", "w", stdout);
        }
        
        /* int TEST = 1; cin >> TEST; while (TEST--) */ Solve();

        cerr << "\nTime elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << "s\n";
        return 0;
}

Compilation message

mecho.cpp: In function 'void Solve()':
mecho.cpp:56:22: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   56 |                 auto [u, v] = q.front();
      |                      ^
mecho.cpp: In lambda function:
mecho.cpp:78:30: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   78 |                         auto [u, v] = q.front();
      |                              ^
mecho.cpp: In function 'int32_t main()':
mecho.cpp:115:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  115 |                 freopen(TASK".INP", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
mecho.cpp:116:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  116 |                 freopen(TASK".OUT", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 6744 KB Output is correct
2 Correct 3 ms 6748 KB Output is correct
3 Correct 3 ms 6748 KB Output is correct
4 Correct 3 ms 6748 KB Output is correct
5 Correct 3 ms 6748 KB Output is correct
6 Correct 3 ms 6760 KB Output is correct
7 Correct 58 ms 6880 KB Output is correct
8 Correct 3 ms 6748 KB Output is correct
9 Correct 3 ms 6748 KB Output is correct
10 Correct 4 ms 6748 KB Output is correct
11 Correct 3 ms 6744 KB Output is correct
12 Incorrect 3 ms 6748 KB Output isn't correct
13 Incorrect 3 ms 6748 KB Output isn't correct
14 Correct 3 ms 6748 KB Output is correct
15 Correct 3 ms 6748 KB Output is correct
16 Correct 3 ms 6748 KB Output is correct
17 Correct 3 ms 6748 KB Output is correct
18 Correct 3 ms 6748 KB Output is correct
19 Correct 3 ms 6748 KB Output is correct
20 Correct 3 ms 6748 KB Output is correct
21 Correct 3 ms 6748 KB Output is correct
22 Correct 3 ms 6748 KB Output is correct
23 Correct 3 ms 6748 KB Output is correct
24 Correct 3 ms 6748 KB Output is correct
25 Correct 3 ms 6768 KB Output is correct
26 Correct 3 ms 6748 KB Output is correct
27 Correct 3 ms 6748 KB Output is correct
28 Correct 3 ms 6748 KB Output is correct
29 Correct 3 ms 6748 KB Output is correct
30 Correct 3 ms 6748 KB Output is correct
31 Correct 3 ms 6772 KB Output is correct
32 Correct 3 ms 6748 KB Output is correct
33 Correct 5 ms 6768 KB Output is correct
34 Correct 5 ms 6664 KB Output is correct
35 Correct 16 ms 6772 KB Output is correct
36 Correct 6 ms 6748 KB Output is correct
37 Correct 5 ms 6748 KB Output is correct
38 Correct 20 ms 6768 KB Output is correct
39 Correct 7 ms 6588 KB Output is correct
40 Correct 6 ms 6748 KB Output is correct
41 Correct 24 ms 6776 KB Output is correct
42 Correct 7 ms 6748 KB Output is correct
43 Correct 7 ms 6748 KB Output is correct
44 Correct 37 ms 6768 KB Output is correct
45 Correct 8 ms 6744 KB Output is correct
46 Correct 8 ms 6588 KB Output is correct
47 Correct 38 ms 6744 KB Output is correct
48 Correct 10 ms 6744 KB Output is correct
49 Correct 9 ms 6592 KB Output is correct
50 Correct 46 ms 6748 KB Output is correct
51 Correct 11 ms 6772 KB Output is correct
52 Correct 11 ms 7000 KB Output is correct
53 Correct 52 ms 6748 KB Output is correct
54 Correct 13 ms 6748 KB Output is correct
55 Correct 13 ms 6748 KB Output is correct
56 Correct 60 ms 6748 KB Output is correct
57 Correct 12 ms 6748 KB Output is correct
58 Correct 11 ms 6592 KB Output is correct
59 Correct 69 ms 6752 KB Output is correct
60 Correct 14 ms 6748 KB Output is correct
61 Correct 13 ms 6748 KB Output is correct
62 Correct 78 ms 6748 KB Output is correct
63 Correct 76 ms 6736 KB Output is correct
64 Correct 117 ms 6748 KB Output is correct
65 Correct 109 ms 6756 KB Output is correct
66 Correct 77 ms 6744 KB Output is correct
67 Correct 64 ms 6744 KB Output is correct
68 Correct 33 ms 6748 KB Output is correct
69 Correct 33 ms 6744 KB Output is correct
70 Correct 23 ms 6748 KB Output is correct
71 Correct 25 ms 6612 KB Output is correct
72 Incorrect 22 ms 6744 KB Output isn't correct
73 Incorrect 45 ms 7000 KB Output isn't correct
74 Correct 49 ms 6996 KB Output is correct
75 Correct 45 ms 7000 KB Output is correct
76 Correct 41 ms 7004 KB Output is correct
77 Correct 41 ms 7036 KB Output is correct
78 Correct 44 ms 7004 KB Output is correct
79 Correct 35 ms 6844 KB Output is correct
80 Correct 44 ms 6848 KB Output is correct
81 Correct 47 ms 7004 KB Output is correct
82 Correct 39 ms 7000 KB Output is correct
83 Correct 59 ms 6744 KB Output is correct
84 Correct 61 ms 6956 KB Output is correct
85 Correct 48 ms 6748 KB Output is correct
86 Correct 55 ms 6744 KB Output is correct
87 Correct 50 ms 6744 KB Output is correct
88 Correct 54 ms 6748 KB Output is correct
89 Correct 54 ms 6748 KB Output is correct
90 Correct 49 ms 6748 KB Output is correct
91 Correct 48 ms 6748 KB Output is correct
92 Correct 54 ms 6912 KB Output is correct